Thermal considerations, Continued), Heat transfer via convection – GE Industrial Solutions EHW007A0B Series (Eighth-Brick) User Manual
Page 9
Data Sheet
October 2, 2009
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
LINEAGE
POWER
9
Thermal Considerations
(continued)
Figure 13. T
ref
Temperature Measurement
Location for Open Frame Module.
Figure 14. T
ref
Temperature Measurement
Location for Module with Heatplate.
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. Derating curves showing the
maximum output current that can be delivered by
each module versus local ambient temperature (T
A
)
for natural convection and up to 3m/s (600 ft./min)
forced airflow are shown in Figure 14.
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
OUT
P
UT
C
URR
E
N
T,
I
O
(A
)
2
3
4
5
6
7
8
20
30
40
50
60
70
80
90
1.0 m/s
(200 LFM)
2.0 m/s
(400 LFM)
3.0 m/s
(600 LFM)
0.5 m/s
(100 LFM)
NC
AMBIENT TEMEPERATURE, T
A
(
o
C
)
Figure 14. Output Current Derating for the Open
Frame Module; Airflow in the Transverse Direction
from Vout(+) to Vout(-); Vin =48V.
O
U
TPU
T
CUR
RE
NT,
I
O
(A
)
3
4
5
6
7
8
20
30
40
50
60
70
80
90
1.0 m/s
(200 LFM)
2.0 m/s
(400 LFM)
0.5 m/s
(100 LFM)
NC
AMBIENT TEMEPERATURE, T
A
(
o
C
)
Figure 15. Output Current Derating for the Module
with Heatplate; Airflow in the Transverse Direction
from Vout(+) to Vout(-); Vin =48V.
O
U
TP
UT
CU
RRE
NT
, I
O
(A
)
3
4
5
6
7
8
20
30
40
50
60
70
80
90
1.0 m/s
(200 LFM)
0.5 m/s
(100 LFM)
NC
AMBIENT TEMEPERATURE, T
A
(
o
C
)
Figure 16. Output Current Derating for the Module
with Heatplate and 0.25 in. heat sink; Airflow in
the Transverse Direction from Vout(+) to Vout(-);
Vin =48V.
OUT
P
UT C
URR
EN
T,
I
O
(A
)
3
4
5
6
7
8
20
30
40
50
60
70
80
90
1.0 m/s
(200 LFM)
0.5 m/s
(100 LFM)
NC
AMBIENT TEMEPERATURE, T
A
(
o
C
)
Figure 17. Output Current Derating for the Module
with Heatplate and 0.5 in. heat sink; Airflow in the
Transverse Direction from Vout(+) to Vout(-); Vin
=48V.
AIRFLOW
AIRFLOW